diff --git a/services/surfaceflinger/LayerBase.h b/services/surfaceflinger/LayerBase.h
index c18f397..4651517 100644
--- a/services/surfaceflinger/LayerBase.h
+++ b/services/surfaceflinger/LayerBase.h
@@ -218,7 +218,7 @@
     /** called after page-flip
      */
     virtual void onLayerDisplayed(const sp<const DisplayDevice>& hw,
-            HWComposer::HWCLayerInterface* layer) { }
+            HWComposer::HWCLayerInterface* layer);
 
     /** called before composition.
      * returns true if the layer has pending updates.